In the production process of aerated concrete, when adjusting the gas generation speed of aluminum powder, the thickening time of slurry, the hardening time of green body and the degree of expansion during autoclave, all kinds of adjusting materials are indispensable. by adding these auxiliary materials, the performance of aerated concrete can be improved obviously.
In production, the commonly used regulating materials are soda ash, borax, water glass, caustic soda, gypsum, triethanolamine, magnesite and so on.
Adjusting the dosage of the material is not immutable, it needs to be adjusted according to the quality of the raw material and the characteristics of the material itself, as well as the actual situation in the production.
1. Soda ash
Soda ash is sodium carbonate (chemical formula is Na2CO3). Its main function is to improve the alkalinity of mixed slurry, accelerate the gas evolution reaction of aluminum powder, accelerate the hardening of green body, shorten the static time after pouring, make aerated concrete cut as soon as possible, and improve the strength of products.
Soda ash is often used in the production of sand, cement and slag aerated concrete products. The addition amount of soda ash is generally 3KG per cubic meter of aerated concrete.
Borax generally presents white crystal particles (chemical molecular formula Na2B4O7). Borax can be divided into anhydrous borax, containing 5 crystal borax and 10 crystal water borax.
In the production of aerated concrete, the main function of borax is to delay the hydration and setting rate of cement in the mixture and adjust the thickening rate of the mixture. Generally, about 0.5 kg of borax is added to the aerated concrete per cubic meter.
3. Sodium silicate, potassium silicate
The main components of water glass are potassium silicate or sodium silicate (chemical formula K2O.nSiO2.
Sodium silicate (Na2O.nSiO2), sodium silicate, potassium silicate, is a kind of soluble alkali metal silicate material, also known as sodium silicate.
Water glass is a liquid substance obtained by calcining quartz powder and sodium carbonate at a high temperature of 1300-1400 degrees Celsius, becoming a solid and dissolving in high temperature or high pressure water.
In the production of aerated concrete, the main function of water glass is to delay the gassing time of aluminum powder in the mixture, eliminate the phenomenon of premature gassing of aluminum powder in the mixture, and make the gas generation time of aluminum powder match the thickening speed of the mixture after pouring.
The amount of liquid water glass per cubic meter of aerated concrete is generally about 300 milliliters.
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